Emerging Trends in the West Nile Virus Epidemiology in Croatia in the ‘One Health’ Context, 2011-2020.
Abstract: West Nile virus (WNV) is one of the most widely distributed (re-)emerging arboviruses. In Croatia, acute WNV infections as well as seropositivity were detected in humans, horses, birds and poultry. Although serologic evidence of WNV human infections dates back to the 1970s, no clinical cases were reported until 2012. WNV outbreaks, as well as sporadic infections, were continuously recorded in continental Croatian counties from 2012 to 2018. In addition, acute asymptomatic infections (IgM antibodies) in horses have been regularly notified in continental regions since 2012, while seropositive horses (seroprevalence rates 3.7-21.4%) were detected in both continental and coastal regions. Moreover, WNV seropositivity in poultry (1.8-22.9%) was reported from 2013 to 2020. During the largest WNV outbreak in 2018, WNV RNA was detected for the first time in two dead goshawks () from the same aviary in North-West Croatia, while WNV antibodies were found in one buzzard () from the same region. In addition, WNV RNA was detected in a dead blackbird () at the Croatian littoral. The phylogenetic analysis of 11 strains detected in urine samples of patients with neuroinvasive disease and 1 strain detected in a goshawk showed circulation of WNV lineage 2. Thus far, WNV has not been detected in mosquitoes in Croatia.
Publication Date: 2021-07-24 PubMed ID: 34449731PubMed Central: PMC8396195DOI: 10.3390/tropicalmed6030140Google Scholar: Lookup
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Summary
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The research investigates the changing patterns of West Nile virus (WNV) infection among various species in Croatia from 2011 to 2020, with a particular focus on the increased occurrence in humans, horses, birds, and poultry.
Background
- The West Nile virus (WNV) is a prevalent infectious disease spread mainly through mosquito bites.
- Historically in Croatia, WNV infections were primarily present in animals, with human infections rarely reported.
Findings
- Since 2012, there have been regular reports of WNV cases among humans in continental regions of Croatia.
- Regular asymptomatic infections have also been reported in horses, with discreet outbreaks in the continental regions as well.
- Detection of the virus has been fairly common in horses across all parts of the country, from 3.7% to 21.4% seroprevalence rates.
- A similar increase in detection of the virus in poultry has been reported from 2013 to 2020, seeing seroprevalence rates between 1.8% and 22.9%.
WNV in Avian Species
- During the largest outbreak in 2018, WNV RNA was detected for the first time in two dead goshawks from the same aviary in North-West Croatia. Similarly, WNV antibodies were found in one buzzard from the same region.
- Additionally, a dead blackbird at the Croatian coast was also found to carry the WNV RNA.
WNV Lineage and Detection in Mosquitoes
- A phylogenetic analysis of samples taken from patients and one goshawk revealed the circulation of the WNV lineage 2. This indicates a common source or similar transmission patterns.
- Despite the spread of WNV among humans and animals, the virus is yet to be detected in the mosquito population in Croatia.
Cite This Article
APA
(2021).
Emerging Trends in the West Nile Virus Epidemiology in Croatia in the ‘One Health’ Context, 2011-2020.
Trop Med Infect Dis, 6(3), 140.
https://doi.org/10.3390/tropicalmed6030140 Publication
Researcher Affiliations
Grant Funding
- IP-2016-06-7456 / Hrvatska Zaklada za Znanost
Conflict of Interest Statement
The authors declare no conflict of interest.
References
This article includes 50 references
- Sambri V, Capobianchi M, Charrel R, Fyodorova M, Gaibani P, Gould E, Niedrig M, Papa A, Pierro A, Rossini G, Varani S, Vocale C, Landini MP. West Nile virus in Europe: emergence, epidemiology, diagnosis, treatment, and prevention.. Clin Microbiol Infect 2013 Aug;19(8):699-704.
- Tsai TF, Popovici F, Cernescu C, Campbell GL, Nedelcu NI. West Nile encephalitis epidemic in southeastern Romania.. Lancet 1998 Sep 5;352(9130):767-71.
- Platonov AE, Shipulin GA, Shipulina OY, Tyutyunnik EN, Frolochkina TI, Lanciotti RS, Yazyshina S, Platonova OV, Obukhov IL, Zhukov AN, Vengerov YY, Pokrovskii VI. Outbreak of West Nile virus infection, Volgograd Region, Russia, 1999.. Emerg Infect Dis 2001 Jan-Feb;7(1):128-32.
- Vilibic-Cavlek T, Savic V, Petrovic T, Toplak I, Barbic L, Petric D, Tabain I, Hrnjakovic-Cvjetkovic I, Bogdanic M, Klobucar A, Mrzljak A, Stevanovic V, Dinjar-Kujundzic P, Radmanic L, Monaco F, Listes E, Savini G. Emerging Trends in the Epidemiology of West Nile and Usutu Virus Infections in Southern Europe.. Front Vet Sci 2019;6:437.
- Bakonyi T, Haussig JM. West Nile virus keeps on moving up in Europe.. Euro Surveill 2020 Nov;25(46).
- European Centre for Disease Prevention and Control. Epidemiological Update: West Nile Virus Transmission Season in Europe. 2018.
- Young JJ, Haussig JM, Aberle SW, Pervanidou D, Riccardo F, Sekulić N, Bakonyi T, Gossner CM. Epidemiology of human West Nile virus infections in the European Union and European Union enlargement countries, 2010 to 2018.. Euro Surveill 2021 May;26(19).
- Vogels CBF, Hartemink N, Koenraadt CJM. Modelling West Nile virus transmission risk in Europe: effect of temperature and mosquito biotypes on the basic reproduction number.. Sci Rep 2017 Jul 10;7(1):5022.
- Barbić L, Listeš E, Katić S, Stevanović V, Madić J, Starešina V, Labrović A, Di Gennaro A, Savini G. Spreading of West Nile virus infection in Croatia.. Vet Microbiol 2012 Oct 12;159(3-4):504-8.
- Selim A, Abdelhady A. The first detection of anti-West Nile virus antibody in domestic ruminants in Egypt.. Trop Anim Health Prod 2020 Nov;52(6):3147-3151.
- Dupuis AP, Prusinski MA, Russell A, O'Connor C, Maffei JG, Oliver J, Howard JJ, Sherwood JA, Tober K, Rochlin I, Cucura M, Backenson B, Kramer LD. Serologic Survey of Mosquito-Borne Viruses in Hunter-Harvested White-Tailed Deer (Odocoileus virginianus), New York State.. Am J Trop Med Hyg 2020 Dec 21;104(2):593-603.
- Bahnson CS, Grove DM, Maskey JJ, Smith JR. Exposure to Select Pathogens in an Expanding Moose (Alces alces) Population in North Dakota, USA.. J Wildl Dis 2021 Jul 1;57(3):648-651.
- Bisanzio D, McMillan JR, Barreto JG, Blitvich BJ, Mead DG, O'Connor J, Kitron U. Evidence for West Nile virus spillover into the squirrel population in Atlanta, Georgia.. Vector Borne Zoonotic Dis 2015 May;15(5):303-10.
- Rocheleau JP, Michel P, Lindsay LR, Drebot M, Dibernardo A, Ogden NH, Fortin A, Arsenault J. Characterizing environmental risk factors for West Nile virus in Q, Canada, using clinical data in humans and serology in pet dogs.. Epidemiol Infect 2017 Oct;145(13):2797-2807.
- García-Bocanegra I, Jurado-Tarifa E, Cano-Terriza D, Martínez R, Pérez-Marín JE, Lecollinet S. Exposure to West Nile virus and tick-borne encephalitis virus in dogs in Spain.. Transbound Emerg Dis 2018 Jun;65(3):765-772.
- Egberink H, Addie DD, Boucraut-Baralon C, Frymus T, Gruffydd-Jones T, Hartmann K, Horzinek MC, Hosie MJ, Marsilio F, Lloret A, Lutz H, Pennisi MG, Radford AD, Thiry E, Truyen U, Möstl K. West Nile virus infection in cats: ABCD guidelines on prevention and management.. J Feline Med Surg 2015 Jul;17(7):617-9.
- Currenti L, Tasca P, Díaz MDP, Contigiani M, Spinsanti L. Serological survey for Saint Louis encephalitis virus and West Nile virus in domestic mammals in Córdoba, Argentina: are our pets potential sentinels?. Arch Virol 2020 Sep;165(9):2079-2082.
- Sejvar JJ. Clinical manifestations and outcomes of West Nile virus infection.. Viruses 2014 Feb 6;6(2):606-23.
- Jean CM, Honarmand S, Louie JK, Glaser CA. Risk factors for West Nile virus neuroinvasive disease, California, 2005.. Emerg Infect Dis 2007 Dec;13(12):1918-20.
- Mrzljak A, Dinjar-Kujundzic P, Santini M, Barbic L, Kosuta I, Savic V, Tabain I, Vilibic-Cavlek T. West Nile Virus: An Emerging Threat in Transplant Population.. Vector Borne Zoonotic Dis 2020 Aug;20(8):613-618.
- McDonald E, Mathis S, Martin SW, Staples JE, Fischer M, Lindsey NP. Surveillance for West Nile Virus Disease - United States, 2009-2018.. MMWR Surveill Summ 2021 Mar 5;70(1):1-15.
- Rizzoli A, Jimenez-Clavero MA, Barzon L, Cordioli P, Figuerola J, Koraka P, Martina B, Moreno A, Nowotny N, Pardigon N, Sanders N, Ulbert S, Tenorio A. The challenge of West Nile virus in Europe: knowledge gaps and research priorities.. Euro Surveill 2015 May 21;20(20).
- Zeller HG, Schuffenecker I. West Nile virus: an overview of its spread in Europe and the Mediterranean basin in contrast to its spread in the Americas.. Eur J Clin Microbiol Infect Dis 2004 Mar;23(3):147-56.
- Bakonyi T, Ivanics E, Erdélyi K, Ursu K, Ferenczi E, Weissenböck H, Nowotny N. Lineage 1 and 2 strains of encephalitic West Nile virus, central Europe.. Emerg Infect Dis 2006 Apr;12(4):618-23.
- Bakonyi T, Ferenczi E, Erdélyi K, Kutasi O, Csörgő T, Seidel B, Weissenböck H, Brugger K, Bán E, Nowotny N. Explosive spread of a neuroinvasive lineage 2 West Nile virus in Central Europe, 2008/2009.. Vet Microbiol 2013 Jul 26;165(1-2):61-70.
- Hernández-Triana LM, Jeffries CL, Mansfield KL, Carnell G, Fooks AR, Johnson N. Emergence of west nile virus lineage 2 in europe: a review on the introduction and spread of a mosquito-borne disease.. Front Public Health 2014;2:271.
- Papa A, Bakonyi T, Xanthopoulou K, Vázquez A, Tenorio A, Nowotny N. Genetic characterization of West Nile virus lineage 2, Greece, 2010.. Emerg Infect Dis 2011 May;17(5):920-2.
- Vesenjak-Hirjan J, Galinovic-Weisglass M, Brudnjak Z, Calisher CH, Tovornik D, Lazuick JS, Rendic Z. Island of Brač—Focus of Arbovirus Infections. Arboviruses in the Mediterranean Countries 1980;pp. 311–317.
- Vesenjak-Hirjan J. Arboviruses in Yugoslavia. Arboviruses in the Mediterranean Countries 1980;pp. 165–177.
- Golubić D, Dobler G. Flaviviruses in the north-west Croatia. Infektol. Glasn. 2012;32:153–157.
- Vilibić-Cavlek T, Barbić L, Ljubin-Sternak S, Pem-Novosel I, Stevanović V, Gjenero-Margan I, Mlinarić-Galinović G. [West nile virus infection: re-emergent disease in Croatia].. Lijec Vjesn 2013 May-Jun;135(5-6):156-61.
- Pem-Novosel I, Vilibic-Cavlek T, Gjenero-Margan I, Pandak N, Peric L, Barbic L, Listes E, Cvitkovic A, Stevanovic V, Savini G. First outbreak of West Nile virus neuroinvasive disease in humans, Croatia, 2012.. Vector Borne Zoonotic Dis 2014 Jan;14(1):82-4.
- Vilibic-Cavlek T, Kaic B, Barbic L, Pem-Novosel I, Slavic-Vrzic V, Lesnikar V, Kurecic-Filipovic S, Babic-Erceg A, Listes E, Stevanovic V, Gjenero-Margan I, Savini G. First evidence of simultaneous occurrence of West Nile virus and Usutu virus neuroinvasive disease in humans in Croatia during the 2013 outbreak.. Infection 2014 Aug;42(4):689-95.
- Vilibic-Cavlek T, Savic V, Sabadi D, Peric L, Barbic L, Klobucar A, Miklausic B, Tabain I, Santini M, Vucelja M, Dvorski E, Butigan T, Kolaric-Sviben G, Potocnik-Hunjadi T, Balenovic M, Bogdanic M, Andric Z, Stevanovic V, Capak K, Balicevic M, Listes E, Savini G. Prevalence and molecular epidemiology of West Nile and Usutu virus infections in Croatia in the 'One health' context, 2018.. Transbound Emerg Dis 2019 Sep;66(5):1946-1957.
- Vilibić-Čavlek T, Petrović T, Savić V, Šekler M, Klobučar A, Petrić D, Tabain I, Vidanović D, Bogdanić M, Lazić G. Importance of Multidisciplinary and Regional Collaboration in Integrated West Nile Virus Surveillance—The “One Health” Concept. Infektol. Glasn. 2019;39:40–47.
- Pervanidou D, Vakali A, Georgakopoulou T, Panagiotopoulos T, Patsoula E, Koliopoulos G, Politis C, Stamoulis K, Gavana E, Pappa S, Mavrouli M, Emmanouil M, Sourvinos G, Mentis A, Tsakris A, Hadjichristodoulou C, Tsiodras S, Papa A. West Nile virus in humans, Greece, 2018: the largest seasonal number of cases, 9 years after its emergence in the country.. Euro Surveill 2020 Aug;25(32).
- Riccò M, Peruzzi S, Balzarini F. Public Perceptions on Non-Pharmaceutical Interventions for West Nile Virus Infections: A Survey from an Endemic Area in Northern Italy.. Trop Med Infect Dis 2021 Jun 29;6(3).
- Sabadi D, Peric L, Savic V, Rubil I, Baraban V, Tabain I, Barbic L, Duvnjak M, Bogdanic M, Stevanovic V, Capak K, Vilibic-Cavlek T. Fatal case of West Nile encephalitis associated with acute anteroseptal ST elevation myocardial infarction (STEMI): a case report.. New Microbiol 2020 Jan;43(1):51-53.
- Konjevoda S, Dzelalija B, Canovic S, Pastar Z, Savic V, Tabain I, Barbic L, Peric L, Sabadi D, Stevanovic V, Vilibic-Cavlek T. West Nile virus retinitis in a patient with neuroinvasive disease.. Rev Soc Bras Med Trop 2019 May 30;52:e20190065.
- Santini M, Zupetic I, Viskovic K, Krznaric J, Kutlesa M, Krajinovic V, Polak VL, Savic V, Tabain I, Barbic L, Bogdanic M, Stevanovic V, Mrzljak A, Vilibic-Cavlek T. Cauda equina arachnoiditis - a rare manifestation of West Nile virus neuroinvasive disease: A case report.. World J Clin Cases 2020 Sep 6;8(17):3797-3803.
- Sabadi D, Perić LJ, Duvnjak M, Rubil I, Grubišić B, Radočaj V, Jovanovac I, Adamović Z, Vilibić-Čavlek T, Savić V. Cerebellitis: A rare clinical manifestation of West Nile infection. Proceedings of the Symposium with International Participation—Diagnosis and Surveillance of West Nile Virus Infections in the “One Health” Context 7 June 2019; Zagreb, Croatia; pp. 14–15.
- Zidovec-Lepej S, Vilibic-Cavlek T, Barbic L, Ilic M, Savic V, Tabain I, Ferenc T, Grgic I, Gorenec L, Bogdanic M, Stevanovic V, Sabadi D, Peric L, Potocnik-Hunjadi T, Dvorski E, Butigan T, Capak K, Listes E, Savini G. Antiviral Cytokine Response in Neuroinvasive and Non-Neuroinvasive West Nile Virus Infection.. Viruses 2021 Feb 22;13(2).
- Madić J, Savini G, Di Gennaro A, Monaco F, Jukić B, Kovac S, Rudan N, Listes E. Serological evidence for West Nile virus infection in horses in Croatia.. Vet Rec 2007 Jun 2;160(22):772-3.
- Savić V, Barbić LJ, Vilibić-Čavlek T, Balenović M, Stevanović V, Listeš E, Savini G. Chickens and horses as sentinels for early warning system in prevention of human West Nile virus infections in Croatia. Slov. Vet. Res. 2016;53(Suppl. S17):292–294.
- Merdić E, Perić L, Pandak N, Kurolt IC, Turić N, Vignjević G, Stolfa I, Milas J, Bogojević MS, Markotić A. West Nile virus outbreak in humans in Croatia, 2012.. Coll Antropol 2013 Sep;37(3):943-7.
- Klobucar A, Benic N, Krajcar D, Kosanovic-Licina ML, Tesic V, Merdic E, Vrucina I, Savic V, Barbic L, Stevanovic V, Pem-Novosel I, Vilibic-Cavlek T. An overview of mosquitoes and emerging arboviral infections in the Zagreb area, Croatia.. J Infect Dev Ctries 2016 Dec 30;10(12):1286-1293.
- Klobucar A, Savic V, Curman Posavec M, Petrinic S, Kuhar U, Toplak I, Madic J, Vilibic-Cavlek T. Screening of Mosquitoes for West Nile Virus and Usutu Virus in Croatia, 2015-2020.. Trop Med Infect Dis 2021 Apr 2;6(2).
- Brdarić D, Fotakis EA, Mavridis K, Vontas J, Bekina H, Sikora M. Mosquito genotipization for species identification, insecticide resistance and pathogens detection in mosquito populations in Osijek-Baranja county. Proceedings of the 32nd Scientific and Educational Seminar with International Participation Disinfection, Disinsection, Deratization and Protection of Stored Agricultural Products 31 March–3 April 2020; Novi Vinodolski, Croatia.
- Kurolt IC, Krajinović V, Topić A, Kuzman I, Baršić B, Markotić A. First molecular analysis of West Nile virus during the 2013 outbreak in Croatia.. Virus Res 2014 Aug 30;189:63-6.
- Vilibic-Cavlek T, Barbic L, Mrzljak A, Brnic D, Klobucar A, Ilic M, Janev-Holcer N, Bogdanic M, Jemersic L, Stevanovic V, Tabain I, Krcmar S, Vucelja M, Prpic J, Boljfetic M, Jelicic P, Madic J, Ferencak I, Savic V. Emerging and Neglected Viruses of Zoonotic Importance in Croatia.. Pathogens 2021 Jan 15;10(1).
Citations
This article has been cited 13 times.- Vilibic-Cavlek T, Stevanovic V, Savic V, Markelic D, Sabadi D, Bogdanic M, Kovac S, Santini M, Tabain I, Potocnik-Hunjadi T, Ferencak I, Skoda AM, Sankovic A, Barbic L. Detection of Tahyna Orthobunyavirus-Neutralizing Antibodies in Patients with Neuroinvasive Disease in Croatia. Microorganisms 2022 Jul 18;10(7).
- Santini M, Haberle S, Židovec-Lepej S, Savić V, Kusulja M, Papić N, Višković K, Župetić I, Savini G, Barbić L, Tabain I, Kutleša M, Krajinović V, Potočnik-Hunjadi T, Dvorski E, Butigan T, Kolaric-Sviben G, Stevanović V, Gorenec L, Grgić I, Glavač F, Mehmedović A, Listeš E, Vilibić-Čavlek T. Severe West Nile Virus Neuroinvasive Disease: Clinical Characteristics, Short- and Long-Term Outcomes. Pathogens 2022 Jan 2;11(1).
- Mohabbat A, Bannazadeh Baghi H. Chronic Neuroplasticity Changes Following Neurotropic Viral Infection: Mechanisms and Implications. Cell Mol Neurobiol 2025 Nov 4;45(1):94.
- Hoxha I, Dervović J, Unterköfler MS, Schlamadinger L, Situmorang T, Fuehrer HP, Obwaller AG, Sekulin K, Camp JV, Harl J, Walochnik J, Alić A, Kniha E. A cross section through mosquitoes of Bosnia and Herzegovina: Barcodes, blood meals and pathogens. One Health 2025 Dec;21:101246.
- Vilibić-Čavlek T, Barbić L, Klobučar A, Vucelja M, Bogdanić M, Sabadi D, Kutleša M, Gjurašin B, Stevanović V, Curman Posavec M, Bjedov L, Boljfetić M, Jozić-Novinc T, Škara R, Tomljenović M, Hruškar Ž, Al-Mufleh M, Potočnik-Hunjadi T, Rončević I, Savić V. Re-Emergence of Usutu Virus and Spreading of West Nile Virus Neuroinvasive Infections During the 2024 Transmission Season in Croatia. Viruses 2025 Jun 13;17(6).
- Barbic L, Stevanovic V, Mauric Maljkovic M, Miletic G, Coric I, Savic V, Masovic V, Bogdanic M, Medic A, Vilibic-Cavlek T. Seroprevalence study for selected zoonotic vector-borne pathogens in sheep from endemic areas of Croatia. Front Vet Sci 2025;12:1602706.
- Anđelić Dmitrović B, Bodulić K, Kurolt IC. Phylogenomic insights into West Nile virus lineage 2 circulating in Croatia. Virol J 2025 May 8;22(1):136.
- Sabadi D, Bodulić K, Savić V, Vlahović Vlašić N, Bogdanić M, Perić L, Tabain I, Lišnjić D, Duvnjak M, Židovec-Lepej S, Grubišić B, Rubil I, Barbić L, Švitek L, Stevanović V, Smajić P, Berišić B, Zlosa M, Rončević I, Vilibić-Čavlek T. Clinical Characteristics, Laboratory Parameters, and Molecular Epidemiology of Neuroinvasive Flavivirus Infections in a Hotspot Region of Eastern Croatia. Pathogens 2025 Jan 14;14(1).
- Vignjević G, Bušić N, Turić N, Varga Z, Zana B, Ábrahám Á, Kurucz K, Vrućina I, Merdić E. First Detection of West Nile Virus Lineage 2 in Culex pipiens Vectors in Croatia. Pathogens 2024 Dec 21;13(12).
- Zidovec-Lepej S, Bodulić K, Bogdanic M, Gorenec L, Savic V, Grgic I, Sabadi D, Santini M, Radmanic Matotek L, Kucinar J, Barbic L, Zmak L, Ferenc T, Stevanovic V, Antolasic L, Milasincic L, Hruskar Z, Vujica Ferenc M, Vilibic-Cavlek T. Proinflammatory Chemokine Levels in Cerebrospinal Fluid of Patients with Neuroinvasive Flavivirus Infections. Microorganisms 2024 Mar 26;12(4).
- Lu L, Zhang F, Oude Munnink BB, Munger E, Sikkema RS, Pappa S, Tsioka K, Sinigaglia A, Dal Molin E, Shih BB, Günther A, Pohlmann A, Ziegler U, Beer M, Taylor RA, Bartumeus F, Woolhouse M, Aarestrup FM, Barzon L, Papa A, Lycett S, Koopmans MPG. West Nile virus spread in Europe: Phylogeographic pattern analysis and key drivers. PLoS Pathog 2024 Jan;20(1):e1011880.
- Ben-Mostafa KK, Savini G, Di Gennaro A, Teodori L, Leone A, Monaco F, Alaoqib MMA, Rayes AA, Dayhum A, Eldaghayes I. Evidence of West Nile Virus Circulation in Horses and Dogs in Libya. Pathogens 2023 Dec 31;13(1).
- Vilibic-Cavlek T, Janev-Holcer N, Bogdanic M, Ferenc T, Vujica Ferenc M, Krcmar S, Savic V, Stevanovic V, Ilic M, Barbic L. Current Status of Vector-Borne Diseases in Croatia: Challenges and Future Prospects. Life (Basel) 2023 Sep 1;13(9).
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